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D( x )
(1-x)/(5-x) < 0
5-x = 0
(4*(1-x))^2*((1-x)/(5-x))^(1/2) = 0
(1-x)/(5-x) < 0
(1-x)/(5-x) < 0
( 1-x )
1-x < 0
-x < -1 // * -1
x > 1
( 5-x )
5-x < 0
-x < -5 // * -1
x > 5
(-oo:1) (1:5) (5:+oo) 1-x + - - 5-x + + -
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
(4*(1-x))^2*((1-x)/(5-x))^(1/2) = 0
(4*(1-x))^2*((1-x)/(5-x))^(1/2) = 0
(4^2*(1-x)^(5/2))/((5-x)^(1/2)) = 0
( 1-x )
1-x = 0 // - 1
-x = -1 // * -1
x = 1
( 4 )
4 = 0
x belongs to the empty set
x in (-oo:1) U (5:+oo)
(x^2)/((4*(1-x))^2*((1-x)/(5-x))^(1/2)) = 0
(x^2*(5-x)^(1/2))/(4^2*(1-x)^(5/2)) = 0
( 5-x )
5-x = 0 // - 5
-x = -5 // * -1
x = 5
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 5}
x = 0
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